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UPMIX PLUGIN
============
The upmix plugin is an easy-to-use plugin for upmixing from 1 or 2
channel stream to 4 or 6-channel stream. The number of channels to be
expanded is determined by the slave PCM. For example, the following
PCM defines upmixing to 5.1 from 2-6 channels input:
pcm.upmix51 {
type upmix
slave.pcm "surround51"
}
You can use this PCM as a default one by defining below:
pcm.!default "plug:upmix51"
The upmix plugin copies left and right channels to rear left and right
with a certain delay. The delay size can be specified by "delay" PCM
option in msec. For example, to set 10ms delay in the above case:
pcm.upmix51 {
type upmix
slave.pcm "surround51"
channels 6
delay 10
}
As default, 15ms delay is used.
The center and LFE channels are the average of sum of left and right
signals.
The accepted format is currently only S16.
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